Mass tourism is harmful to the environment In recent years, there were many problems about mass tourism, which raise our concern about the mass tourism. Mass tourism means large, uncontrolled numbers of tourists. With the development of economy and the growth in the living standard，tourism is booming. It is obvious that tourists enhance the development of hotels and shopping facilities, which，in turn，creates jobs for local people. It makes contribution to our society, meanwhile, do harm to our environment if the number of tourists is uncontrolled. So, I think mass tourism is harmful to the environment. On the one hand, thousands of people visiting an area would cause more pollution. For instance, air pollution, water pollution, etc. With so many visitors crowding into the tourism city, there is an increasing demand for different means of transportation, such as buses, cars, metros, etc. At the same time, the more gases are demanded, the more waste gases were sent out, which could lower the air quality. It is well known that exhaust released by automobiles is one of the primary reasons causing air pollution. With many travelers flocking to different destinations, the problem of water pollution is also acquiring attention. Many people who visit an area are sometimes careless in their manner. They have food, paper, and bottles behind, which harm water resource. Because if it rains, we can see that the rubbish flowed by rainwater to rivers or to the sea. Sometimes, mass tourists even litter in the river, which also cause the water pollution. On the other hand, the overcrowding will threaten the protection of tourist sites that some of them are natural heritage. Such as some mountains or sea, where has unique feature, which appeal to a mass of tourists. The mass tourism could results in damage of the local environment. The careless people could harm plants, animals or objects important to a local culture because those on vocation often didn’t realize that the damage they can cause. It is undeniable that the worsening environment has become the biggest concern of the present day world. The environment damage is the price we have to pay for the rapid economic development. Tourism is one of the main reasons that improve economic returns and cause pollution. Thus, some actions need to be taken to control the number of tourist, in order to protect our ecological system. We firmly believe that tourism should be developed harmoniously with environmental protection.